单项选择题
If the low level alarm of the diesel fuel day tank fails to function, you can expect trouble from（）
A.overheated injection pumps B.water condensed in the cylinders C.fuel dilution of the lube oil D.air in the fuel system
单项选择题 Before starting a diesel engine, you should always（）
单项选择题 Sludge formation in a diesel engine lube oil system is caused by（）
单项选择题 A diesel engine is turned at normal cranking speed, but fails to fireThis can occur from （）
